Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of blue to green color tunable silicate phosphor and preparation method thereof

A fluorescent powder and silicate technology, applied in chemical instruments and methods, luminescent materials, etc., to achieve the effects of low synthesis temperature, simple preparation method, and broad application prospects

Inactive Publication Date: 2019-06-25
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, a similar fluorescent material LaGaO with tunable emission color has been reported. 3 :xTb 3+ , where Tb 3+ The doping amount of ions is La 3+ 0.01-12% moles of ions, it is a fluorescent material that can be adjusted from blue to green, but the fluorescent material has a strong excitation peak at 278nm, so it is necessary to seek new Blue-to-green color-tunable phosphors efficiently excited by near-ultraviolet light

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of blue to green color tunable silicate phosphor and preparation method thereof
  • A kind of blue to green color tunable silicate phosphor and preparation method thereof
  • A kind of blue to green color tunable silicate phosphor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh sodium carbonate (Na 2 CO 3 ) 0.1590g, barium carbonate (BaCO 3 ) 1.7760g, silicon dioxide (SiO 2 ) 1.0802g, lanthanum oxide (La 2 o 3 ) 1.3825g, cerium oxide (CeO 2 )0.0108g, terbium oxide (Tb 4 o 7 ) 0.0841g, fully ground in an agate mortar and mixed evenly, pre-fired at 500°C for 12 hours in an air atmosphere, cooled to room temperature naturally, took out the sample and ground it, then sintered at 950°C for 12 hours in an air atmosphere, and cooled naturally To room temperature, the sample is taken out and ground to obtain the final product, and the obtained phosphor material is composed of: NaBa 3 La 2.829 Ce 0.021 Tb 0.15 Si 6 o 20 .

[0036] Under the excitation of near-ultraviolet light at 335nm, the fluorescent powder material of this embodiment has stronger emission peaks at 350-460nm, weaker emission peaks at 475-510nm and 530-565nm, showing stronger blue light, see image 3 Middle a curve; its color coordinates are (0.1968, 0.2227), see ...

Embodiment 2

[0038] Weigh sodium bicarbonate (NaHCO 3 ) 0.2521g, barium nitrate (Ba(NO 3 ) 2 ) 2.3520g, tetraethyl orthosilicate 4.0237ml, lanthanum hydroxide (La(OH) 3 ) 1.5507g, ammonium cerium nitrate ((NH 4 ) 2 Ce(NO 3 ) 6 ) 0.0344g, terbium nitrate (Tb(NO 3 ) 3 ) 0.3104g, fully ground in an agate mortar and mixed evenly, pre-fired at 600°C for 24 hours in an air atmosphere, cooled to room temperature naturally, took out the sample and ground it, then sintered at 880°C for 24 hours in an air atmosphere, and cooled naturally to room temperature. The sample is taken out and ground to obtain the final product, and the composition of the obtained phosphor material is: NaBa 3 La 2.679 Ce 0.021 Tb 0.3 Si 6 o 20 .

[0039] Under the excitation of 335nm near-ultraviolet light, the phosphor material of this embodiment, compared with Example 1, has weaker emission peaks at 350-460nm, stronger emission peaks at 475-510nm and 530-565nm, and still shows stronger blue light, see ima...

Embodiment 3

[0041] Weigh sodium nitrate (NaNO 3 ) 0.2550g, barium oxide (BaCO 3 ) 1.3800g, silicon dioxide (SiO 2 ) 1.0802g, lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) 3.2850g, cerous nitrate (Ce(NO 3 ) 3 ·6H 2 O) 0.0272g, terbium oxalate (3[C 2 o 4 -2].2[Tb +3 ].H 2 (2) 0.4049g, after fully grinding and mixing in an agate mortar, pre-fired at 800°C for 10 hours in an air atmosphere, cooled to room temperature naturally, took out the sample and ground it, and then sintered it at 950°C for 10 hours in an air atmosphere. Let cool to room temperature. The sample is taken out and ground to obtain the final product, and the composition of the obtained phosphor material is: NaBa 3 La 2.529 Ce 0.021 Tb 0.45 Si 6 o 20 .

[0042] Under the excitation of 335nm near-ultraviolet light, the phosphor material of this embodiment, compared with Example 2, the 350-460nm emission peak continues to weaken, and the 475-510nm and 530-565nm emission peaks continue to strengthen, showing stronger...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses silicate phosphor with color capable of being regulated from blue to green and a preparation method thereof. The chemical constitution expression of the phosphor is NaBa3La3(1-x-y)Ce3xTb3ySi6O20, wherein x and y represent the mole percentage coefficients of Ce<3+> and Tb<3+> relative to La<3+>, 0.001<=x<=0.01, and 0.05<=y<=0.40. The phosphor belongs to an orthorhombic system, and a space group belongs to Ama2. The emission peak of the phosphor ranges from 345 nm to 630 nm under excitation of 310-385-nm ultraviolet, the proportion of the near ultraviolet and the blue-green light emission peak can be effectively regulated by regulating the doping proportion of Ce<3+> and Tb<3+>, and then the adjustable blue-to-green light emission effect of the phosphor is achieved. The preparation method of the phosphor has the advantages that the raw materials are easy to obtain, the process is simple, and the cost is low.

Description

technical field [0001] The invention relates to the field of luminescent materials. More specifically, it relates to a blue-to-green color-tunable silicate phosphor excited by a violet LED and a preparation method thereof. Background technique [0002] White LEDs are considered to be the fourth-generation lighting sources that are expected to replace traditional lighting due to their advantages of energy saving, environmental protection, long life, small size, and short response time. The current commercialized white LED implementation scheme is to coat the blue LED chip with yellow phosphor (mainly Y 3 al 5 o 12 : Ce), part of the blue light emitted by the LED chip is absorbed by the phosphor and emits yellow light, and the other part directly escapes and mixes with the yellow light to form white light. This solution can achieve high-efficiency white light output, but there is a lack of red light in white light, and the blue light emitted by the LED chip participates in...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/79
CPCC09K11/7774
Inventor 李如康贾贞夏明军
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com